Blue dyestuff and process of making same.



Irl'o Drawing.

TED sTA'rEs PATENT OFFICE MAX HESSENLAND, 0F iIfiCHST-ON-THE-MAIN, GERMANY, ASSIGNOR T0 FABBWERKE VORM. MEISTER LUCIUS & BR'U'NING, OF HGCHST'ONTHEFMAIN, GERMANY, A COR- PORATEON 0'5 GERMANY.

BLUE DYESTUFF AND PROCESS OF MAKING, SAME.

To all whom-it may concern: v

Be it known that'l, MAX HnssnNn 'No, Ph. ll, chemist, a citizen of the Empire of Germany, residing at Hochst-on-the-M'ain,

agents to act upon L l-aminoanthraquinonylanthranilic acid, a greenish-blue dyestufl' is obtained, which is remarkable for its properties and which can'be used both as a pigment dye and as a vat dye.

The new product is the ramino-anthraquinone-a-acridonei the formation of which from the 1.4 amino anthraquinonyl an'-' thranilic acid may be interpreted by the following formulae:

water, alcohol, ether, scarcely soluble in Specification of Letters Patent.

Application filed- October 31, 1910. Serial No. 589,997.

Patent ed July 2.5, 1911.

cial acetic acid, but capable of-being recrystallized from nitrobenze'ne. The color of its solution in concentrated sulfuric acid is brown. When treated with alkaline hydrosulfite it--yields a violet vat which dyes cotton; on oxidation in the air, beautiful greenish ulue tints. v

Having now described myinvention, what I claim is:

1. As a new product, the 4-amino-anthraquinoneu-acrido'ne obtainable from the 1.4- amino-anthraquinonyl anthranilicacid, being a greenish-blue powder, insoluble in alcohol. ether and water, scarcely soluble in glacial acetic acid, capable of being recrystallized from nitrobenzene, soluble in concentrated sulfuric acid to a brown solution,

in alkaline hydrosulfite to a violet solution, yielding a vat which dyes cotton, on oxidation in the air, brightgreenish-blue tints.

2. The process of producing l-amino-nnthraquinone a acridone, which consists in treating 1.4 amino-anthraquinonyl-anthranilic acid with dehydrating agents.

3; The process of producing 4-amino-anthralquinone-a-acridone. which consists in treating 1.4 amino-anthraquinonyl-anthranilic acidwith chlorosulfonic acid.

' In testimony whereof, I aflixmy signature presence of two witnesses.

MAX HESSENLAND. lVitnesses JEAN GRUND, CARL GRUND. 

